Steam News announces that everyone is now invited to play Endless Space, Amplitude Studios' space strategy game. The event isn't endless, however, and the free period will conclude on Sunday at 4:00 pm EST, but the accompanying 50% off sale on the game will continue until the next day at 1:00 pm EST. Here's word on the game:

This galaxy is ancient. Its first intelligent life was the civilization we call the Endless and all that remains of this people is what we call Dust. This substance has been found scattered throughout the galaxy and lost in forgotten temples, it once gave powers to admirals and galactic governors. The galaxy will belong to the faction that can take control of the Dust and uncover its secrets…

Guide one of eight civilizations as you strive for galactic dominion within hundreds of star systems. Play against up to seven opponents in quick match-ups or endless war. Generate an infinity of random galaxies where every start begins a new adventure and optimize each fleet for epic battles.